code: def sq(x):
      m2 = 1.0
      m1 = -20.0
      m0 = 50.0
      return m2 * x * x + m1 * x + m0
  
file_path: ray/python/ray/train/examples/horovod/horovod_tune_example.py
imports: import time
  import numpy
  import torch
  import ray
  import ray.train.torch
  from ray import train, tune
  from ray.train import ScalingConfig
  from ray.train.horovod import HorovodTrainer
  from ray.tune.tune_config import TuneConfig
  from ray.tune.tuner import Tuner
label_desc: Use image node_id 1 for calling a global function with example usage: sq(x) and returns: unknown